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This series products is a kind of quickly manual Self-centering chuck. The three jaws can be used as a set of internal jaws and a set of external ones.Please put on the three jaws from 1 to 3 when you install the chuck,then you can rotate the hand shank,it can easy to clamp the workpiece.
Diagram:

Parameter
Type | D1 | D2 | D3 | D4 | H | H1 | H2 | L | Z-d1 | Z-d |
Wp300 | 100 | 120 | 150 | 300 | 69 | 39 | 21 | 240 | 6-M6 | 3-M8×30 |


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